US Bridges

Ringbone Mine Rd. over Napias Creek

Fair

Lemhi County, Idaho · No Data Entered · Structure no. 041301000001196

Built
1994
31 years old
Condition
Fair
inspected October 2023
Type
Girder and Floorbeam System
Steel
Length
101 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Ringbone Mine Rd. over Napias Creek is a steel girder and floorbeam system carrying Ringbone Mine Rd. over Napias Creek in Lemhi County, Idaho. It was built in 1994, so it is 31 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 101 ft (30.8 m) long and 18 ft wide.

Location

Open in Google Maps
CarriesRingbone Mine Rd.
CrossesNapias Creek
LocationNo Data Entered
RouteFederal Lands Road 60098
CountyLemhi County
StateIdaho
Coordinates45.16687, -114.16131
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.8 US tons
Inventory rating54.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length101 ft (30.8 m)
Longest span100 ft (30.5 m)
Deck width18 ft (5.6 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byPrivate (other than railroad)
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ringbone Mine Rd. over Napias Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Ringbone Mine Rd. over Napias Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does Ringbone Mine Rd. over Napias Creek carry?

About 50 vehicles per day (latest count).

How long is Ringbone Mine Rd. over Napias Creek?

The structure is 101 ft (30.8 m) long with a longest span of 100 ft (30.5 m) and a deck 18 ft wide.

Who owns Ringbone Mine Rd. over Napias Creek?

It is owned by the U.S. Forest Service and maintained by the Private (other than railroad).